You said you have after market tail lights. When you plugged the factory ones everything worked fine. Then you bought new LED that don't work. plug the factory one back in and see if it works. If they don't work then use a testlight to see if you have power to the bulb IF so then replace the bulbs. If you don't have power check the wiring and fuses with a testlight on both sides of fuses.
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I had a bad circuit board for my taillights and i replaced it and nothing worked, afetr swapping back to factory and no luck i put the aftermarket back on and disconnected my battery for an hour and hooked it back up and no problems.
Some of the 3457 style LEDs, I've found out there is a polarity on them and need to be rotated or rewired on the four exit leads. I would go back with the orig OEM incandescents and start at square-one to make sure the electrical system is still good, getting a good burn all around.
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Help needed - no brake lights
